class Chassis(object):

    def __init__(self,x = 0,y = 0,speed = 0):
        #position
        self.x,self.y = x,y
        #speed
        self.speed = speed
        self.shape = (width,height)

    def move(self,dx,dy):
        self.x += dx
        self.y += dy
    def __str__(self):
        return 'postion: (' + str(self.x) + ','+str(self.y) + ') '+ 'num: '
